WO2019198119A1 - Dispositif d'allumage pour moteur à combustion interne - Google Patents

Dispositif d'allumage pour moteur à combustion interne Download PDF

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Publication number
WO2019198119A1
WO2019198119A1 PCT/JP2018/014850 JP2018014850W WO2019198119A1 WO 2019198119 A1 WO2019198119 A1 WO 2019198119A1 JP 2018014850 W JP2018014850 W JP 2018014850W WO 2019198119 A1 WO2019198119 A1 WO 2019198119A1
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Prior art keywords
ignition
primary coil
superposition
coil
energy
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PCT/JP2018/014850
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English (en)
Japanese (ja)
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義文 内勢
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日立オートモティブシステムズ阪神株式会社
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Priority to PCT/JP2018/014850 priority Critical patent/WO2019198119A1/fr
Priority to JP2020512946A priority patent/JP7012830B2/ja
Publication of WO2019198119A1 publication Critical patent/WO2019198119A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/10—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having continuous electric sparks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations

Definitions

  • the present invention relates to an ignition device for an internal combustion engine mounted on a motor vehicle, and obtains good discharge characteristics by increasing the discharge energy generated on the secondary side of the ignition coil in a superimposed manner.
  • Direct-injection engines and high-EGR engines are adopted as internal combustion engines mounted on vehicles to improve fuel efficiency.
  • these engines are not very ignitable, so a high-energy ignition system is required.
  • a phase discharge ignition device has been proposed in which the output of another ignition coil is additionally superimposed on the secondary output of the ignition coil generated by the classic current interruption principle (for example, Patent Document 1). See).
  • the ignition device described in Patent Document 1 by interrupting the primary current of the main ignition coil, the high voltage of several kV generated on the secondary side thereof causes dielectric breakdown in the discharge gap of the spark plug, thereby igniting.
  • the primary current of the auxiliary ignition coil connected in parallel with the main ignition coil is cut off, and a DC voltage of several kV generated on the secondary side is additionally superimposed.
  • the discharge energy on the secondary side can be increased without lengthening the energization time to the primary coil. It is also possible to consider a method for increasing the pressure and maintaining stable combustion. However, such a method requires a booster circuit that boosts the power supply voltage to several kV, so that the withstand voltage of the circuit to be mounted and the connection tolerance at a high voltage are required, resulting in a considerable increase in cost. . In addition, the use of the booster circuit increases the power consumption for ignition, which causes a deterioration in fuel consumption.
  • an object of the present invention is to provide an ignition device for an internal combustion engine that can improve the ignitability due to spark discharge generated in the spark plug, and can also reduce the deterioration of fuel consumption by optimizing the power consumption for ignition.
  • an ignition device for an internal combustion engine is configured to apply discharge energy to the secondary side of the ignition coil by controlling the energization of the ignition coil by the ignition control means, and to the spark plug.
  • energy superimposing means capable of increasing discharge energy by superimposing energy to the secondary side of the ignition coil, and after the ignition timing in the ignition cycle
  • Primary coil voltage detection means for detecting the voltage of the primary coil that reflects the voltage generated in the secondary coil
  • the ignition control means detects the change in the primary coil voltage detected by the primary coil voltage detection means. If the superposition start condition defined in advance as a state in which the discharge path of the spark discharge generated in the spark plug is difficult to maintain is satisfied, It actuates the is characterized in that so as to overlap the discharge energy to the secondary side of the ignition coil.
  • the ignition control means is detected by the primary coil voltage detection means after a predetermined primary coil voltage monitoring start condition is satisfied. That the primary coil voltage thus reached reaches a predetermined superposition start reference voltage value is used as a superposition start condition.
  • the energy superimposing means flows on the secondary side of the ignition coil by generating a spark discharge in the spark plug. It is characterized in that a current is further superimposed on the secondary current.
  • the invention according to claim 4 is configured to control the energization of the ignition coil by the ignition control means, thereby giving discharge energy to the secondary side of the ignition coil to cause a spark discharge in the spark plug.
  • the ignition coil includes a main primary coil in which a forward magnetic flux amount is increased by energization of a main primary current and a forward magnetic flux amount is decreased by cutting off the main primary current;
  • the primary primary coil is connected to the ignition plug at one end side by generating a magnetic flux in the cutoff direction opposite to the forward direction by energizing the secondary primary current at an arbitrary timing after the energization cutoff of the primary primary coil.
  • the primary primary coil voltage detection means for detecting the voltage of the primary primary coil that reflects the voltage generated in the secondary coil, and the magnetic flux in the cutoff direction generated by switching between energization and cutoff to the secondary primary coil acting on the secondary coil
  • Energy superimposing means for superimposing discharge energy on the secondary side of the ignition coil
  • the ignition control means is configured such that the change in the main primary coil voltage detected by the main primary coil voltage detecting means
  • the energy superimposing means is activated to superimpose the discharge energy on the secondary side of the ignition coil. It is characterized by.
  • the ignition control means includes a main primary coil voltage detecting means after a predetermined main primary coil voltage monitoring start condition is satisfied.
  • the main primary coil voltage detected by the above is used as a superposition start condition to reach a predetermined superposition start reference voltage value.
  • the invention according to claim 6 is the ignition device for an internal combustion engine according to any one of claims 1 to 5, wherein the ignition control means is configured to discharge electric energy when the superposition start condition is satisfied. After the superposition is started, the superposition energy amount given to the secondary side by the energy superposition means is further increased when the superposition correction condition defined in advance as a state in which the spark generated in the spark plug is concerned is concerned. It is characterized by that.
  • the invention according to claim 7 is the internal combustion engine ignition device according to claim 6, wherein the ignition control means reaches a superposition correction voltage value set in advance as a value exceeding the superposition start reference voltage value. Is used as the superimposition correction condition.
  • the discharge energy superimposing means performs ignition. Since the discharge energy is superimposed on the secondary side of the coil, the discharge current can flow while maintaining the discharge path where the spark discharge is extended. When a sufficient discharge current flows through the greatly extended discharge path, a large flame nucleus can be formed in the cylinder, and the ignitability can be improved. Moreover, since the energy superposition control by the ignition control means is not performed until the superposition start condition is satisfied, the power consumption for the energy superposition control can be suppressed to a necessary minimum level, and the deterioration of fuel consumption can be reduced.
  • FIG. 1 is a schematic configuration diagram showing a first embodiment of an ignition device for an internal combustion engine according to the present invention. It is a schematic block diagram which shows an example of the superimposition control means provided in the internal combustion engine drive control apparatus of the ignition device for internal combustion engines which concerns on 1st Embodiment. It is the wave form diagram which showed typically the principal part waveform of the energy superimposition control which the superimposition control means in 1st Embodiment performs. It is a schematic block diagram which shows 2nd Embodiment of the ignition device for internal combustion engines which concerns on this invention. It is a schematic block diagram which shows an example of the superimposition control means provided in the internal combustion engine drive control apparatus of the ignition device for internal combustion engines which concerns on 2nd Embodiment.
  • FIG. 1 shows an internal combustion engine ignition device 1 according to a first embodiment of the present invention.
  • An ignition coil unit 10A that generates a discharge spark in one ignition plug 20 provided for each cylinder of the internal combustion engine; Spark discharge occurs in the internal combustion engine drive control device 30A as an ignition control means for outputting an ignition signal Si or the like for instructing the operation timing of the ignition coil unit 10A at an appropriate timing, the DC power source 40 such as a vehicle battery, and the spark plug 20.
  • the secondary current flowing on the secondary side of the ignition coil is further configured by secondary current superimposing means 50A or the like that causes the current to further overlap.
  • the secondary current superimposing means 50A functions as an energy superimposing means capable of increasing discharge energy by superimposing energy to the secondary side of the ignition coil 11A included in the ignition coil unit 10A.
  • the function as the ignition control means is included in the internal combustion engine drive control device 30A that comprehensively controls the internal combustion engine of the automobile. It is not limited. For example, it receives an ignition signal generated by an ignition signal generation function of a normal internal combustion engine drive control device 30A such as an ECU, generates an appropriate control signal, and generates an ignition coil unit 10A or secondary current superimposing means 50A.
  • An ignition control device that outputs a control signal may be provided separately.
  • the ignition coil unit 10A includes, for example, an ignition coil 11A, an ignition switch 12A, a bypass line 13 provided in parallel with the ignition switch 12A, a rectifying means 14 provided on the bypass line 13 and the like in a case 15 having a required shape, and an integrated structure. It is a unit.
  • a high voltage terminal 151 and a connector 152 are provided at appropriate positions of the case 15, and the spark plug 20 is connected via the high voltage terminal 151 and also connected to the internal combustion engine drive control device 30 ⁇ / b> A and the DC power supply 40 via the connector 152. To do.
  • the ignition coil 11A efficiently causes the magnetic flux generated in the primary coil 111 to act on the secondary coil 112.
  • the primary coil 111 is disposed so as to surround the center core 113, and the secondary coil 112 is disposed outside thereof. It is an arranged structure.
  • the first end 111-1 which is one end of the primary coil 111, is connected to the DC power supply 40 via the connector 152, and a power supply voltage VB + (for example, 12 V) is applied.
  • the second end 111-2 which is the other end of the primary coil 111 is connected to the collector of the ignition switch 12A, and the emitter of the ignition switch 12A is connected to the ground point GND via the connector 152.
  • the ignition signal Si output from the internal combustion engine drive control device 30A at an appropriate timing of the discharge cycle is input to the gate of the ignition switch 12A (for example, when the signal level of the ignition signal Si changes from L to H).
  • the ignition switch 12A is turned on, the second end 111-2 of the primary coil 111 is connected to the ground point GND, and the primary current I1 from the first end 111-1 to the second end 111-2 is connected to the primary coil 111. Begins to flow, and the flow rate of the primary current I1 increases exponentially.
  • a magnetic flux amount corresponding to the flow rate of the primary current I1 is accumulated as magnetic field energy. Note that electrical energy is accumulated on the secondary side of the ignition coil 11A due to minute capacitor components such as the secondary coil 112 and connection wiring.
  • a bypass line 13 is provided in parallel with the ignition switch 12A, and a rectifying means 14 (for example, a cathode is provided on the collector side of the ignition switch 12A) that is forward from the ground point side of the bypass line 13 toward the ignition coil 11A side. , A diode having an anode connected to the emitter side of the ignition switch 12A).
  • the secondary current I2 that flows to the secondary side when a spark discharge is generated between the discharge electrodes of the spark plug 20 is useful as information for knowing the combustion state in the cylinder, and is therefore used to detect the secondary current I2.
  • Secondary current detection means may be provided.
  • the secondary current detection means includes, for example, a current detection resistor 61 having an appropriate resistance value inserted in a secondary current path between the secondary current superimposing means 50A and the ground point GND, and the current detection resistor 61. And a secondary side voltage detection line 62 for detecting a voltage change due to.
  • the secondary current detection signal obtained from the secondary side voltage detection line 62 is supplied to the internal combustion engine drive control device 30A, and the internal combustion engine drive control device 30A is supplied to the secondary coil 112 based on this secondary current detection signal.
  • the current value that flows can be known.
  • the voltage generated in the secondary coil 112 that applies a high voltage to the spark plug 20 (hereinafter referred to as the secondary coil voltage) is also useful as information for knowing the combustion state.
  • the secondary voltage information may be acquired at the detection point Psp set between the secondary coil 112 and the secondary coil 112.
  • the secondary voltage is a high voltage ranging from several kV to several tens of kV, It is necessary to consider various problems such as leakage due to the provision of the resistor, and it is not realistic to monitor the secondary coil voltage at the detection point Psp.
  • the primary coil when the spark plug 20 is discharged, a voltage corresponding to the turn ratio between the primary coil 111 and the secondary coil 112 is also generated in the primary coil 111, and the voltage generated in the primary coil 111 (hereinafter referred to as the primary coil). (Referred to as “voltage”), since the voltage value is relatively low, the difficulty for monitoring is low. However, the primary coil voltage and the secondary coil voltage have different voltage value scales and have opposite polarities. Considering this difference, the primary coil voltage can be handled as correlation information of the secondary coil voltage.
  • the primary coil voltage detecting means for detecting the voltage on the low side of the primary coil the second end 111-2 of the primary coil 111 and the bypass line
  • the primary coil voltage detection line 16 is drawn out from the 13 branch points, and the primary coil voltage signal is input to the internal combustion engine drive control device 30A via the connector 152.
  • the internal combustion engine drive control device 30A it is possible to know a change in the applied voltage to the spark plug 20 by estimating the secondary coil voltage based on the primary coil voltage signal.
  • the energy superposition control using the secondary current superimposing means 50A is executed by the function of the superposition control means 31 provided in the internal combustion engine drive control device 30A, for example.
  • a current source of the secondary current superimposing means 50A a DC power source 40 such as a vehicle battery can be used as a DC power source 40 such as a vehicle battery can be used.
  • the superimposition control unit 31 includes a superimposition timing determination unit 301 that determines the timing of start and end of superimposition, and a superimposition start reference voltage value that is used as information for the superimposition timing determination unit 301 to determine the superposition start timing (details later). And a secondary current superposition signal for generating and outputting a secondary current superposition signal Sp for operating the secondary current superposition means 50A in accordance with the start of superposition. Generating means 303.
  • the superimposition timing determination means 301 is supplied with the ignition signal Si, the primary coil voltage signal, and the superposition start reference voltage value from the superposition start reference voltage value storage means 302, and the ignition timing IG when the ignition signal Si changes from ON to OFF. Thereafter, it is determined whether the superposition start timing ⁇ satisfying the superposition start condition is satisfied. For example, as shown in the waveform diagram of FIG. 3A, capacity discharge energy (electric energy accumulated on the secondary side) is consumed at the ignition timing IG due to the primary current interruption, and the primary voltage rapidly increases (FIG. 3). (A) The primary coil voltage waveform becomes larger at the negative electrode, and decreases in a short time (returns to the positive electrode side in the primary coil voltage waveform of FIG.
  • the superposition start reference voltage value may be set as a positive value.
  • the determination of the superposition start condition may be started after a predetermined primary coil voltage monitoring start condition is satisfied, instead of starting supervision start condition determination monitoring immediately after the ignition timing IG.
  • the primary coil voltage monitoring start condition is that the absolute value of the primary coil voltage suddenly increases at the ignition timing IG and then falls below the superposition start reference voltage value. After the primary coil voltage monitoring start condition is satisfied, the primary coil voltage monitoring start condition is satisfied. If it is determined that the absolute value of the coil voltage has reached the superposition start reference voltage value again as the superposition start condition, the superposition start reference voltage value may be exceeded instantaneously due to secondary side voltage fluctuations due to capacitive discharge. Can be prevented from being erroneously determined that the superposition start condition is satisfied.
  • the primary coil voltage monitoring start condition is that a predetermined period (for example, several tens of ⁇ s) that can be regarded as capacitive discharge has passed and the state is considered to have shifted to induction discharge. It may be determined that the superposition start condition is that the absolute value of the primary coil voltage has reached the superposition start reference voltage value again after the monitoring start condition is satisfied.
  • the superposition timing determination unit 301 determines this as the superposition start timing ⁇ , A secondary current superposition start instruction is issued to the current superposition signal generation means 303.
  • the secondary current superposition signal generation means 303 generates the secondary current superposition signal Sp and outputs it to the secondary current superposition means 50A, and the secondary current is superposed by the secondary current superposition means 50A (FIG. (Refer to the shaded area in the secondary current waveform of 3 (a)). If the secondary current detection signal is supplied to the secondary current superposition signal generation means 303 (indicated by a broken line in FIG.
  • the superposition control of the secondary current I2 using the secondary current superposition means 50A is appropriate.
  • the secondary current superposition signal generation means 303 can determine whether or not If it is determined that the energy superposition control is not properly performed, for example, the fact is notified to notify the passenger of the abnormality, and if the energy superposition control is once stopped, the secondary current superimposing means 50A becomes meaningless. Power consumption can be suppressed.
  • the superposition start reference voltage value stored in the superposition start reference voltage value storage means 302 is a primary in which the voltage generated in the secondary coil 112 is reflected after the ignition timing IG that interrupts energization of the primary coil 111.
  • the change in the coil voltage is a reference value for determining success or failure of a predetermined superposition start condition as it is difficult to maintain the discharge path of the spark discharge generated between the discharge electrodes of the spark plug 20.
  • the secondary coil voltage value (warning voltage value) when it is assumed that it is difficult to maintain the extended discharge path due to the spark discharge generated between the discharge electrodes of the plug 20 being swollen by the rumble flow in the cylinder. ) Is replaced with the primary coil voltage value.
  • inductive discharge can be maintained at a relatively low voltage by capacitive discharge that occurs immediately after the current interruption of the primary coil 111, and the air-fuel mixture between the discharge electrodes of the spark plug 20 is ionized and the resistance value decreases.
  • the secondary coil voltage increases after the secondary current due to induction discharge begins to flow, because the spark discharge generated between the discharge electrodes of the spark plug 20 is caused to flow by the rumble flow generated in the cylinder, and is extended. Since it is considered that the resistance value between the discharge electrodes is increased in order to cause the discharge current to flow through the long-distance discharge path, the spark plug 20 is monitored by monitoring the secondary coil voltage value based on the primary coil voltage value. It is possible to determine the timing at which it is assumed that it is difficult to maintain the discharge path of the spark discharge generated between the two discharge electrodes.
  • the superposition start timing ⁇ is set so that the situation assumed to be difficult to maintain the discharge path of the spark discharge generated in the spark plug 20 is detected based on the primary coil voltage, the superposition start is started.
  • Energy superposition control can be started immediately with the determination of timing ⁇ , and a large flame kernel can be formed by flowing a discharge current that can maintain the discharge path where the spark discharge has been extended, so that high ignition performance can be realized. is there.
  • the optimum value of the superposition start reference voltage value varies depending on the characteristics of the ignition coil 11A, the spark plug 20, and the like.
  • the superposition start timing ⁇ is that the superposition start condition that is considered to require superposition of the secondary current I2 is satisfied, and the superposition start condition is met. Therefore, the power consumption for the energy superposition control is suppressed to the minimum necessary level. That is, in the internal combustion engine ignition device 1 of the present embodiment, even if the energy superimposition control is performed in order to improve the ignition performance, it is possible to prevent the fuel consumption from being extremely deteriorated.
  • the flow velocity of the tumble flow generated in the cylinder is not stably maintained at 20 [m / s] and may vary greatly.
  • the discharge path of the spark plug 20 is extended.
  • the period until the superposition start condition is satisfied and the superposition start timing ⁇ is reached also becomes longer, and the secondary current superimposing means 50A superimposes the secondary current I2 on the secondary current I2 in order to flow a discharge current that can maintain the discharge path where the spark discharge has extended.
  • the period to be shortened see the shaded area in the secondary current waveform in FIG. 3B).
  • the secondary current I2 is not excessively superposed, and the power consumption for the energy superposition control is suppressed to the minimum necessary level.
  • the power consumption can be optimized to reduce fuel consumption. Further, by not flowing the secondary current I2 more than necessary, electrode wear and the like of the spark plug 20 can be suppressed, so that there is an effect of preventing the life of the spark plug 20 from being shortened by energy superposition control.
  • the end timing of the energy superposition control performed by the superposition control means 31 is arbitrary.
  • the timing at which the primary coil voltage falls to a predetermined superposition stop reference voltage value is set as the superposition control end timing ⁇ , and when this superposition control end timing ⁇ is reached, the superposition timing determination unit 301 performs the secondary current superposition signal generation unit 303.
  • the secondary current superposition signal Sp is output from the secondary current superposition signal generation means 303 to the secondary current superposition means 50A by stopping the secondary current superposition start instruction (or outputting the secondary current superposition end instruction). Without this, the secondary current superposition function by the secondary current superposition means 50A can be stopped.
  • the superposition control end timing ⁇ is set, and the energy superposition control is finished. You may do it.
  • a secondary current path is provided as energy superimposing means capable of increasing discharge energy by superimposing energy to the secondary side of the ignition coil 11A.
  • the energy superimposing means is not limited to this.
  • the inductive discharge energy is superimposed from the primary side to the secondary side after the ignition timing IG, and thus generated in the spark plug 20. It can also be set as the structure which improves the ignitability by the made spark discharge.
  • the internal combustion engine ignition device 2 shown in FIG. 4 includes an ignition coil unit 10B provided with an ignition coil 11B, and a drive control function corresponding to the ignition coil unit 10B.
  • the internal combustion engine drive control device 30B includes superimposition control means 32 that superimposes discharge energy on the secondary side by controlling the ignition coil 11B.
  • symbol is attached
  • the ignition coil 11B of the ignition coil unit 10B efficiently acts on the secondary coil 112 (for example, 9000 turns) with the magnetic flux generated in the main primary coil 111a (for example, 90 turns) and the sub-primary coil 111b (for example, 60 turns).
  • the primary primary coil 111a and the secondary primary coil 111b are arranged so as to surround the center core 113, and the secondary coil 112 is further arranged outside thereof.
  • the primary end 111a-1 which is one end of the main primary coil 111a is connected to the DC power supply 40 via the connector 152, and a power supply voltage VB + (for example, 12V) is applied.
  • the second end 111a-2 which is the other end of the main primary coil 111a, is connected to the collector of the main ignition switch 12B, and the emitter of the main ignition switch 12B is connected to the ground point GND via the connector 152.
  • the main ignition switch 12B is turned on and the second end 111a-2 of the main primary coil 111a is connected to the ground point GND, and the main primary coil 111a is directed from the first end 111a-1 to the second end 111a-2.
  • the main primary current I1a flows to generate a forward magnetic flux (energization magnetic flux).
  • the main ignition switch 12B When the main primary coil ignition signal Sa output from the internal combustion engine drive control device 30B is turned off (for example, when the signal level of the main primary coil ignition signal Sa changes from H to L), the main ignition switch 12B is turned off. Thus, energization to the main primary coil 111a is cut off. As a result, the discharge energy due to the capacitive component is given to the secondary coil 112, a discharge spark is generated between the discharge electrodes of the spark plug 20, and the energizing magnetic flux acting also on the secondary coil 112 via the center core 113. Disappears rapidly.
  • the attenuation of the energized magnetic flux is apparently considered as a magnetic flux in the opposite direction to the energized magnetic flux (hereinafter referred to as a cut-off magnetic flux) is generated to reduce the energized magnetic flux. That is, the magnetic flux amount of the magnetic flux to be supplied is reduced by the interruption magnetic flux generated by the interruption of the electric current to the main ignition coil 111a, and the change in the magnetic flux amount generates a high-voltage electromotive force according to the winding ratio between the primary side and the secondary side. Since it is generated in the secondary coil 112, the discharge energy by the inductive component is given to the secondary side of the ignition coil 11B.
  • the secondary primary coil 111b capable of applying a magnetic field to the secondary coil 112 via the iron core 113 has the first end 111b-1 as its one end connected to the connector 152.
  • the second end 111b-2 which is the other end, is connected to the sub primary coil energization permission switch 71 via the connector 152.
  • the on / off of the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 is controlled by the internal combustion engine drive control device 30B, and the first end 111b-1 side of the sub primary coil 111b is connected to the DC power source 40.
  • the two ends 111b-2 are respectively connected to the ground point GND, the superimposed current I1b from the first end 111b-1 to the second end 111b-2 flows through the sub-primary coil 111b.
  • the magnetic flux generated when the DC power source 40 is energized to the main primary coil 111a is in the opposite direction (the cutoff magnetic flux that is virtually generated when the main primary coil 111a is de-energized).
  • Superimposed magnetic flux in the same direction is generated. That is, when the superimposed current I1b is passed through the sub-primary coil 111b after the energization interruption timing to the main primary coil 111a, the superimposed magnetic flux is added to the interruption magnetic flux, thereby accelerating the attenuation of the energization magnetic flux.
  • the induction discharge energy induced in 112 can be increased in a superimposed manner.
  • the sub primary coil 111b the sub primary coil energization permission switch 71 for performing energization / shut-off control on the sub primary coil 111b, and the sub primary The coil energization switch 72 functions as an energy superimposing means capable of increasing discharge energy by superimposing energy to the secondary side of the ignition coil 11B.
  • the secondary current I2 is reduced even if the ion concentration in the air-fuel mixture between the discharge electrodes of the spark plug 20 decreases and the resistance value between the discharge electrodes increases.
  • the secondary voltage can be maintained at a high voltage so as to continue to flow, and a stable high current period can be secured to improve the ignitability.
  • the winding directions of the main primary coil 111a and the sub primary coil 111b are reversed,
  • the feeding direction to the primary coil 111a and the feeding direction to the sub-primary coil 111b may be reversed.
  • the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 used for the energization control of the ignition coil 11B described above may be provided separately, or the sub primary coil provided separately from the ignition coil unit 10B.
  • a unit structure in which the energization permission switch 71 and the sub primary coil energization switch 72 are housed in the same case may be employed. Further, if a semiconductor device having high withstand voltage and noise resistance is used as the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72, it may be provided in the case 15 of the ignition coil unit 10B.
  • the sub primary coil energization permission switch 71 can be constituted by a power MOS-FET having a high-speed switching characteristic, and the source of the sub primary coil energization permission switch 71 is connected to the second end 111b-2 side of the sub primary coil 111b.
  • the drain of the permission switch 71 is connected to the ground point GND side, and the sub primary coil energization permission signal Sb1 is input to the gate of the sub primary coil energization permission switch 71 from the superposition control means 32 of the internal combustion engine drive control device 30B.
  • the sub primary coil energization permission signal Sb1 when the sub primary coil energization permission signal Sb1 is turned on (for example, the signal level is L to H), the sub primary coil energization permission switch 71 is turned on, and the second end 111b-2 of the sub primary coil 111b is connected to the grounding point. It will be connected to GND.
  • a current detection resistor 81 having an appropriate resistance value is interposed in the sub primary current path between the drain of the sub primary coil energization permission switch 71 and the ground point GND, and the voltage generated by the current detection resistor 81
  • the sub primary voltage detection line 82 for detecting the change and the current detection resistor 81 constitute a sub primary current detection means.
  • the sub primary current detection signal obtained from the sub primary voltage detection line 82 is supplied to the internal combustion engine drive control device 30B. Based on this sub primary current detection signal, the superimposition control means 32 determines the sub primary current flowing through the sub primary coil 111b. I can know.
  • the superimposing control means 32 generates appropriate sub primary coil energization permission signal Sb1 and sub primary coil energization signal Sb2 using the detected value of the sub primary current, and appropriately generates the superimposed magnetic flux to be generated in the sub primary coil 111b. It becomes possible to control to.
  • the sub primary coil energization switch 72 can also be constituted by a power MOS-FET, the drain of the sub primary coil energization switch 72 is on the DC power supply 40 side, and the source of the sub primary coil energization switch 72 is the first end 111b of the sub primary coil 111b.
  • the sub primary coil energization signal Sb2 is input from the superposition control means 32 to the gate of the sub primary coil energization switch 72 connected to the ⁇ 1 side.
  • the sub primary coil energization switch 72 is turned on, and the DC power supply 40 is connected to the first end 111b-1 of the sub primary coil 111b.
  • the power supply voltage VB + is applied.
  • a boost power supply circuit 73 (indicated by a two-dot chain line in FIG. 4) may be provided so that the power supply voltage VB + from the DC power supply 40 can be boosted and supplied to the sub-primary coil 111b. In this way, the voltage applied to the sub primary coil 111b can be increased to increase the superimposed current I1b flowing through the sub primary coil 111b, so that larger energy can be superimposed from the sub primary coil 111b to the secondary coil 112. It becomes possible.
  • a voltage generated in the main primary coil 111a (hereinafter referred to as a main primary coil voltage) is used as correlation information of the secondary coil voltage. Therefore, in the ignition coil unit 10B of the internal combustion engine ignition device 2 according to the present embodiment, the second end 111a-2 of the main primary coil 111a is used as main primary coil voltage detection means for detecting the voltage on the low side of the main primary coil. And the primary primary coil voltage detection line 17 is drawn from between the branch point of the bypass line 13 and the primary primary coil voltage signal is input to the superposition control means 32 of the internal combustion engine drive control device 30B via the connector 152.
  • the superimposition control unit 32 stores a superimposition timing determination unit 301 that determines the timing of the start and end of superposition, and a superimposition start reference voltage value that is used as information for the superimposition timing determination unit 301 to determine the superposition start timing.
  • Superimposition start reference voltage value storage means 302 and the sub primary coil energization permission signal Sb1 and the sub primary coil energization signal for operating the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 in accordance with the start of superposition, respectively.
  • Sub-primary coil control means 304 for generating and outputting Sb2.
  • the superposition timing determination means 301 is supplied with the ignition signal Si, the main primary coil voltage signal, and the superposition start reference voltage value from the superposition start reference voltage value storage means 302, and the ignition timing at which the ignition signal Si changes from ON to OFF. After IG, it is determined whether the superposition start timing satisfying the superposition start condition is satisfied. For example, as shown in the waveform diagram of FIG. 6 (a), the capacity discharge energy (electric energy accumulated on the secondary side) is consumed at the ignition timing IG by the main primary current interruption, and the primary voltage is rapidly increased (FIG. 6). 6 (a), the main primary coil voltage waveform becomes larger in the negative electrode), and decreases in a short time (returns to the positive electrode side in the main primary coil voltage waveform in FIG. 6 (a)), and the superposition start reference voltage After falling below the value, the timing at which the main primary coil voltage rises again and reaches the superposition start reference voltage value is determined as the superposition start timing ⁇ .
  • the determination of the superposition start condition may not be started immediately after the ignition timing IG, but may be started after a predetermined main primary coil voltage monitoring start condition is satisfied.
  • the main primary coil voltage monitoring start condition is satisfied when the absolute value of the main primary coil voltage suddenly increases at the ignition timing IG and then falls below the superposition start reference voltage value, and this main primary coil voltage monitoring start condition is satisfied. If the superposition start condition is determined that the absolute value of the main primary coil voltage has reached the superposition start reference voltage value again, the superposition start reference voltage value is instantaneously exceeded due to the voltage fluctuation on the secondary side accompanying the capacity discharge. In such a case, it is possible to prevent erroneous determination that the superposition start condition is satisfied.
  • the main primary coil voltage monitoring start condition is that a predetermined period (for example, several tens of ⁇ s) that can be regarded as capacitive discharge has passed and the state that can be regarded as transitioning to induction discharge is set as the main primary coil voltage monitoring start condition. It may be determined that the superposition start condition is that the absolute value of the primary coil voltage has reached the superposition start reference voltage value again after the coil voltage monitoring start condition is satisfied.
  • the superposition timing determination unit 301 determines this as the superposition start timing ⁇ , A sub primary coil energization start instruction is issued to the sub primary coil control means 304.
  • the sub primary coil control means 304 generates the sub primary coil energization permission signal Sb1 and the sub primary coil energization signal Sb2 and outputs them to the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72, respectively.
  • the energization of the primary coil 111b is started, the induced electromotive force on the secondary side is increased, and the secondary current is superimposed (see the shaded area in the secondary current waveform in FIG. 6A). ).
  • the sub primary coil control means 304 simultaneously outputs the sub primary coil energization permission signal Sb1 and the sub primary coil energization signal Sb2 at the superposition start timing ⁇ .
  • the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 are simultaneously operated to generate a superimposed magnetic flux in the sub primary coil 111b, the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72
  • the operation timing does not have to be the same, and the sub-primary coil control means 304 to the sub-primary coil energization permission switch 71 at an appropriate timing (for example, ignition timing IG) before outputting the sub-primary coil energization signal Sb2.
  • the sub primary coil energization permission signal Sb1 is output and the sub primary coil energization signal Sb1 is output. It may be stopped sub primary coil energization permission signal Sb1 at an appropriate timing after stopping.
  • the sub primary coil control means 304 can determine whether or not. If it is determined that the energy superimposition control is not properly performed, for example, the fact is notified to notify the passenger of the abnormality, and if the energy superimposition control is temporarily stopped, it is meaningless by energizing the sub primary coil 111b. Power consumption can be suppressed.
  • the superimposing control means 32 can arbitrarily adjust the pulse width of the sub primary coil energization signal Sb2, the sub primary coil energization switch 72 is subjected to PWM control so that the magnetic flux intensity of the superimposed magnetic flux generated in the sub primary coil 111b is increased. Can be adjusted. For example, if the pulse width of the sub-primary coil energization signal Sb2 is set so that the superimposed energy optimized according to the characteristics of the internal combustion engine or the like to be controlled is given to the secondary side, it is given to the secondary coil 112 It is possible to keep the induction discharge energy at a necessary and sufficient level, which is useful for further improving fuel consumption.
  • the energy superposition control performed by the superposition control means 32 is also the same as the superposition control means 31 in the internal combustion engine ignition device 1 of the first embodiment.
  • the superposition start timing ⁇ is that the superposition start condition that is difficult to maintain the discharge path of the spark discharge generated in the spark plug 20 is established, and the energy superposition control is not performed until the superposition start condition is met.
  • the power consumption for the is kept to the minimum necessary level. That is, even in the internal combustion engine ignition device 2 of the second embodiment, even if the energy superimposition control is performed in order to improve the ignition performance, it is possible to prevent the fuel consumption from being extremely deteriorated.
  • the primary coil voltage does not reach the superposition start reference voltage value for a relatively long time from the ignition timing IG
  • the superposition start condition is satisfied and the superposition is started.
  • the period until the start timing ⁇ is also lengthened, and in order to ensure a stable high current period of the secondary current I2, a period in which the superimposed current of the secondary primary coil 111b is applied to the secondary side to superimpose the secondary current I2 Becomes shorter (see the shaded area in the secondary current waveform in FIG. 6B).
  • the secondary current I2 is excessively superimposed as in the internal combustion engine ignition device 1 of the first embodiment. This is not performed, and the power consumption for the energy superposition control can be suppressed to the minimum necessary level. Therefore, the power consumption for ignition can be optimized to reduce the deterioration of fuel consumption. Further, by not flowing the secondary current I2 more than necessary, electrode wear and the like of the spark plug 20 can be suppressed, so that there is an effect of preventing the life of the spark plug 20 from being shortened by energy superposition control.
  • the end timing of the energy superposition control performed by the superposition control means 32 of the internal combustion engine ignition device 2 according to the second embodiment is also arbitrary.
  • the elapsed time measured from the ignition timing IG is necessary for stable combustion maintenance.
  • the time when the high current holding time determined as a sufficiently high current period is reached may be set as the superposition control end timing ⁇ to end the energy superposition control.
  • the sub primary coil energization permission signal Sb1 and the sub primary coil energization signal Sb2 output from the sub primary coil control unit 304 do not need to be stopped at the same time. For example, they are necessary and sufficient for energy superposition control by energizing the sub primary coil 111b. After the sub primary coil energization signal Sb2 is stopped for a long upper limit time, the sub primary coil energization permission signal Sb1 may be stopped after a slight lapse time.
  • the secondary current that is superimposed after the ignition timing IG is satisfied and the superimposed secondary current is suppressed to a relatively low first level, and thereafter
  • this first level secondary current superimposition control is performed to increase the superimposed secondary current to a relatively high second level only when it is determined that there is a fear of sparks generated in the spark plug 20. To do.
  • the internal combustion engine ignition device 3 of the third embodiment it is possible to realize stable combustion of the internal combustion engine while further reducing the possibility that the fuel consumption is deteriorated by the energy superposition control.
  • the internal combustion engine ignition device 3 shown in FIG. 7 includes an ignition coil unit 10A provided with an ignition coil 11A, and a drive control function corresponding to the ignition coil unit 10A.
  • An internal combustion engine drive control device 30C having a first superimposing operation for superimposing a secondary current corresponding to a relatively low first level and a second superimposing operation for superimposing a secondary current corresponding to a relatively high second level
  • the secondary current superimposing means 50C that can be executed by switching is provided.
  • symbol is attached
  • the internal combustion engine drive control device 30C it is possible to know a change in the applied voltage to the spark plug 20 by estimating the secondary coil voltage based on the primary coil voltage signal.
  • Secondary current superposition control is performed by the secondary current superimposing means 50C.
  • the energy superposition control using the secondary current superimposing means 50C is executed by the function of the superposition control means 33 provided in the internal combustion engine drive control device 30C, for example.
  • a DC power source 40 such as a vehicle battery can be used as a current source of the secondary current superimposing means 50C.
  • the superimposition control unit 33 includes a superimposition control timing determination unit 305 that determines the control timing of superimposition start / update and end, and a superimposition used by the superimposition control timing determination unit 305 as information for determining the superimposition start control timing.
  • Superimposition start reference voltage value storage means 302 that stores the start reference voltage value and superimposition correction voltage value (detailed later) used as information for superimposition control timing determination means 305 to determine the control timing of superimposition update.
  • the stored superposition correction voltage value storage means 306 and the secondary current superposition for generating and outputting the secondary current superposition control signal Sp for operating the secondary current superposition means 50C in accordance with superposition start and superposition update.
  • the superimposition control timing determination means 305 includes an ignition signal Si, a primary coil voltage signal, a superposition start reference voltage value from the superposition start reference voltage value storage means 302, and a superposition correction voltage value from the superposition correction voltage value storage means 306.
  • the ignition timing IG when the voltage value is supplied and the ignition signal Si is turned from ON to OFF, it is determined whether the superposition start timing satisfies the superposition start timing. For example, as shown in the waveform diagram of FIG. 9 (a), the capacity discharge energy (electric energy accumulated on the secondary side) is consumed at the ignition timing IG due to the primary current interruption, and the primary voltage rapidly increases and becomes short.
  • the timing at which the primary coil voltage rises again and reaches the superposition start reference voltage value is determined as the superposition start timing ⁇ 1.
  • the primary coil voltage monitoring start condition is that a predetermined period (for example, several tens of ⁇ s) that can be regarded as capacitive discharge has passed and the state is considered to have shifted to induction discharge. It may be determined that the superposition start condition is that the absolute value of the primary coil voltage has reached the superposition start reference voltage value again after the monitoring start condition is satisfied.
  • the superposition control timing determination unit 305 determines this as the superposition control start timing ⁇ 1
  • a secondary current superposition control start instruction is issued to the current superposition control signal generation means 307.
  • the secondary current superposition control signal generation means 307 that has received this secondary current superposition control start instruction instructs the first superposition operation to superimpose the secondary current corresponding to the relatively low first level.
  • a signal Sp (for example, the signal potential is Lev1) is generated and output to the secondary current superimposing means 50C. Receiving this, the secondary current superimposing means 50C performs the first superimposing operation, so that the secondary current corresponding to the first level is superimposed.
  • the superimposition control timing determination means 305 determines whether or not a superimposition correction condition predetermined as a state in which the spark generated in the spark plug 20 is a concern is based on the superimposition correction voltage value stored in the superimposition correction voltage value storage unit 306. Judgment. Specifically, the superimposition correction condition is satisfied when the primary coil voltage value detected by the primary coil voltage detection means reaches a superimposition correction voltage value set in advance as a value exceeding the superimposition start reference voltage value. The timing ⁇ 2 is determined.
  • the superposition correction voltage value stored in the superposition correction voltage value storage means 306 is that the secondary current rises sufficiently even after the secondary current is superposed by the secondary current superposition means 50C as the energy superposition means.
  • the secondary coil voltage value that can be determined to be not is replaced with the primary coil voltage value. That is, the detected primary coil voltage is increased from the superposition start reference voltage value to the superposition correction voltage value because the resistance value between the discharge electrodes in the spark plug 20 is further increased. Since it is considered that the discharge current sufficient to maintain the discharge path is not flowing (a state in which the spark generated in the spark plug 20 is likely to be blown off), the secondary current superimposing means 50C is changed from the first superposition operation to the first. It becomes an opportunity to switch to 2 superimposition operation.
  • the superimposition control timing determination unit 305 determines that the superimposition correction timing ⁇ 2 is established, it issues a secondary current correction instruction to the secondary current superposition control signal generation unit 307.
  • the secondary current superposition control signal generation means 307 that has received this secondary current correction instruction instructs the secondary current superposition control signal Sp that instructs the second superposition operation to superimpose the secondary current corresponding to the relatively high second level.
  • the signal potential is Lev2
  • the secondary current superimposing means 50C receives this, the secondary current superimposing means 50C performs the second superposition operation, so that the secondary current corresponding to the second level higher than the first level is superposed, and the rising slope of the secondary current can be accelerated.
  • the secondary current superposition control signal Sp having a different potential level is sent from the superposition control means 33 to the secondary current superposition means 50C via one secondary current superposition control signal line.
  • the first superimposing operation and the second superimposing operation are instructed to the secondary current superimposing means 50C by supplying, the present invention is not limited to this.
  • a signal line for the first operation instruction and a signal line for the second operation instruction are separately provided and the input path of the instruction signal to the secondary current superimposing means 50C is separated, an error in the signal potential due to noise mixing can be obtained. Since the malfunction of the secondary current superimposing means 50C due to the determination can be prevented, the stability of the energy superposition control can be improved.
  • the secondary current detection signal is supplied to the secondary current superposition control signal generation means 307 (shown by a broken line in FIG. 8), superposition control of the secondary current I2 using the secondary current superposition means 50C is performed.
  • the secondary current superposition control signal generation means 307 can determine whether or not it is properly performed. If it is determined that the energy superposition control is not properly performed, for example, the fact is notified to notify the passenger of the abnormality, and if the energy superposition control is once stopped, the secondary current superimposing means 50C becomes meaningless. Power consumption can be suppressed.
  • the superposition start reference voltage value for determining the establishment of the superposition control start timing ⁇ 1 and the superposition correction voltage value for judging the formation of the superposition correction timing ⁇ 2 depend on the characteristics of the ignition coil 11A, the spark plug 20, and the like. Since the optimum values are different, for example, by inputting a superposition start reference voltage value setting signal to the superposition start reference voltage value storage unit 302 (indicated by a broken line in FIG. 8), an arbitrary value is stored in the superposition start reference voltage value storage unit 302.
  • the superposition start reference voltage value may be set, or by inputting a superposition correction voltage value setting signal to the superposition correction voltage value storage means 306 (indicated by a broken line in FIG. 8), the superposition correction voltage is set.
  • An arbitrary superposition correction voltage value may be set in the value storage unit 306.
  • the superposition control start timing indicates that the superposition start condition that is considered to be in a state in which it is difficult to maintain the discharge path of the spark discharge generated in the spark plug 20 to the last. Since ⁇ 1 is set and energy superposition control is not performed until the superposition start condition is satisfied, power consumption for the energy superposition control is suppressed to a necessary minimum level. That is, in the internal combustion engine ignition device 1 of the present embodiment, even if the energy superimposition control is performed in order to improve the ignition performance, it is possible to prevent the fuel consumption from being extremely deteriorated.
  • the superposition start condition is satisfied and the superposition is started.
  • the period of superimposing on the secondary current I2 by the current superimposing means 50C is shortened (see the shaded area in the secondary current waveform of FIG. 9B).
  • the secondary current I2 is not excessively superposed, and the power consumption for the energy superposition control is suppressed to the minimum necessary level.
  • the power consumption can be optimized to reduce fuel consumption. Further, by not flowing the secondary current I2 more than necessary, electrode wear and the like of the spark plug 20 can be suppressed, so that there is an effect of preventing the life of the spark plug 20 from being shortened by energy superposition control.
  • the first superposition operation for superimposing the secondary current corresponding to the relatively low first level is performed on the secondary current superimposing means 50C, so that the discharge path of the spark discharge generated in the spark plug 20 is maintained. If it is possible, the primary coil voltage does not reach the superimposition correction voltage value thereafter, so that the secondary current superimposing means 50C is not shifted to the second superposition operation. Also in this point, the internal combustion engine ignition device 3 according to the present embodiment is further effective in reducing the deterioration of fuel consumption and preventing the life of the spark plug 20 from being shortened.
  • the end timing of the energy superposition control performed by the superposition control means 33 is arbitrary. For example, the timing at which the primary coil voltage falls to a predetermined superposition stop reference voltage value is set as the superposition control end timing ⁇ . When this superposition control end timing ⁇ is reached, the superposition control timing determination unit 305 generates the secondary current superposition control signal. By stopping the secondary current superposition start instruction to the means 307 (or outputting the secondary current superposition end instruction), the secondary current superposition control is performed from the secondary current superposition control signal generation means 307 to the secondary current superposition means 50C. The secondary current superimposing function by the secondary current superimposing means 50C can be stopped without outputting the signal Sp.
  • the superposition control end timing ⁇ is set, and the energy superposition control is finished. You may do it.
  • the internal combustion engine ignition device 3 according to the third embodiment described above is sufficient to quickly extend the discharge path by adjusting the superposition of the secondary current by the secondary current superimposing means 50C with respect to the ignition coil unit 10A. The possibility of causing re-striking by flowing a discharge current was reduced. Similarly, by adjusting the superimposed magnetic flux by the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 with respect to the ignition coil unit 10B, a sufficient discharge current is caused to flow in the discharge path where the spark discharge is extended. . It is also possible to reduce the risk of re-striking.
  • the superposition magnetic flux generated in the auxiliary primary coil 111b is suppressed to a relatively low first level after the ignition timing IG is satisfied, and thereafter, Control for increasing the superposed magnetic flux generated in the sub-primary coil 111b to a relatively high second level only when it is determined that the first level superposed magnetic flux is in a state where there is a fear of sparks generated in the spark plug 20. To do.
  • the internal combustion engine ignition device 4 shown in FIG. 10 includes an ignition coil unit 10B provided with an ignition coil 11B, a secondary primary coil energization permission switch 71, and a secondary primary.
  • An internal combustion engine drive control device 30D having a drive control function corresponding to the coil energization switch 72, the ignition coil unit 10B, the sub primary coil energization permission switch 71, and the sub primary coil energization switch 72 is provided.
  • symbol is attached
  • the internal combustion engine drive control device 30D it is possible to know a change in the voltage applied to the spark plug 20 by estimating the secondary coil voltage based on the primary coil voltage signal.
  • the operations of the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 By controlling the operations of the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72, the generation timing and the amount of magnetic flux of the superimposed magnetic flux by the sub primary coil 111b are controlled.
  • the operation control of the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72 is executed by the function of the superposition control means 34 provided in the internal combustion engine drive control device 30D, for example.
  • the superimposition control unit 34 includes a superimposition control timing determination unit 305 that determines a control timing for starting / updating or ending superimposition, and a superimposition used by the superimposition control timing determination unit 305 as information for determining a control timing for starting superimposition.
  • Superimposition start reference voltage value storage means 302 that stores the start reference voltage value, and superimposition correction voltage value that is used as information for the superimposition control timing determination means 305 to determine the control timing of superposition update is stored.
  • the superimposition control timing determination means 305 includes an ignition signal Si, a main primary coil voltage signal, a superposition start reference voltage value from the superposition start reference voltage value storage means 302, and a superposition correction from the superposition correction voltage value storage means 306. For example, after the ignition timing IG at which the ignition voltage Si is supplied and the ignition signal Si is turned from ON to OFF, it is determined whether the superposition start timing satisfies the superposition start timing. For example, as shown in the waveform diagram of FIG. 12 (a), the capacity discharge energy (electrical energy accumulated on the secondary side) is consumed at the ignition timing IG due to the primary current interruption, and the primary voltage is rapidly increased, resulting in a short time.
  • the timing at which the main primary coil voltage rises again and reaches the superposition start reference voltage value is determined as the superposition start timing ⁇ 1.
  • the main primary coil voltage monitoring start condition is that a predetermined period (for example, several tens of ⁇ s) that can be regarded as capacitive discharge has passed and the state that can be regarded as transitioning to induction discharge is set as the main primary coil voltage monitoring start condition. It may be determined that the superposition start condition is that the absolute value of the main primary coil voltage has reached the superposition start reference voltage value again after the coil voltage monitoring start condition is satisfied.
  • the superposition control timing determination unit 305 determines this as the superposition control start timing ⁇ 1
  • a sub primary coil energization start instruction is issued to the sub primary coil control means 308.
  • the sub primary coil control means 304 generates the sub primary coil energization permission signal Sb1 and the sub primary coil energization signal Sb2 and outputs them to the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72, respectively.
  • Energization of the primary coil 111b is started, the induced electromotive force on the secondary side is increased, and the secondary current is superimposed.
  • the superimposed magnetic flux generated in the sub primary coil 111b is set to a relatively low first level.
  • the first superposition operation is suppressed.
  • the superimposition control timing determination unit 305 determines that the superimposition control start timing ⁇ 1 is established, the sub primary coil energization signal Sb1 and the sub primary coil energization signal Sb2 from the sub primary coil control unit 308 are used. After the ON / OFF of the permission switch 71 and the sub primary coil energization switch 72 is controlled, the first level superimposed magnetic flux is generated in the sub primary coil 111b, and the secondary current at the first level is superimposed. The superimposition control timing determination unit 305 determines whether or not a superimposition correction condition determined in advance as a state in which the spark generated in the spark plug 20 is a concern is stored in the superimposition correction voltage value storage unit 306. Judge based on the value.
  • the superimposition correction condition is established when the main primary coil voltage value detected by the main primary coil voltage detection means reaches a superimposition correction voltage value set in advance as a value exceeding the superposition start reference voltage value.
  • the superimposition correction timing ⁇ 2 is determined.
  • the superimposition correction voltage value stored in the superimposition correction voltage value storage means 306 means that the first level superposition magnetic flux from the sub-primary coil 111b acts on the secondary coil 112 and the secondary current is superimposed.
  • the secondary coil voltage value that can be determined that the rising slope of the secondary current is not sufficient is replaced with the main primary coil voltage value. That is, the detected primary primary coil voltage is increased from the superposition start reference voltage value to the superposition correction voltage value because the resistance value between the discharge electrodes in the spark plug 20 is further increased.
  • the superimposition magnetic flux correction instruction is issued to the sub primary coil control unit 308.
  • the sub primary coil control means 308 changes the sub primary coil energization signal Sb ⁇ b> 2 having a relatively high duty ratio to be output to the sub primary coil energization switch 72.
  • the energization amount to the sub primary coil 111b is compared by changing the sub primary coil energization signal Sb2 to a relatively high duty ratio of the on-time ⁇ 2 (where ⁇ 1 ⁇ 2) with respect to the clock cycle T.
  • the second superimposing operation increases the superposed magnetic flux generated in the secondary primary coil 111b to a relatively high second level by increasing the target second high level. That is, the secondary current corresponding to the second level higher than the first level is superposed by performing the second superposition operation that causes the secondary coil 112 to be subjected to the magnetic flux change to which the relatively high second level superposed magnetic flux is applied. As a result, the rising slope of the secondary current can be accelerated (see the shaded area in the secondary current waveform in FIG. 12A). Reduce the likelihood of a like. That is, according to the internal combustion engine ignition device 4 according to the fourth embodiment, since a large flame kernel can be formed more reliably in the cylinder, the ignitability can be further improved and stable combustion can be realized. .
  • the first superposition operation is changed to the second superposition operation by increasing the duty ratio of the sub primary coil energization signal Sb2 supplied from the superposition control means 34 to the sub primary coil energization switch 72.
  • the present invention is not limited to this as long as the superimposed magnetic flux generated by the sub primary coil 111b can be increased.
  • the sub-primary coil control unit 308 When the duty ratio of the sub-primary coil energization signal Sb2 generated by the sub-primary coil control unit 308 of the superposition control unit 34 is made constant and the first superposition operation is changed to the second superposition operation, the sub-primary coil control unit 308 By outputting a boosting operation signal to the boosting power supply circuit 73 (indicated by a broken line in FIG. 11), the boosting power supply circuit 73 is operated to increase the voltage applied to the sub-primary coil 111b, and the superimposed magnetic flux is increased to the second level. Such a second superposition operation may be used.
  • the first control is performed by controlling the operation of the sub primary coil energization permission switch 71 and the sub primary coil energization switch 72.
  • the sub-primary coil control means 308 can determine whether or not the superposition operation or the second superposition operation is properly performed. If it is determined that the energy superimposition control is not properly performed, for example, the fact is notified to notify the passenger of the abnormality, and if the energy superposition control is temporarily stopped, the sub primary coil energization permission switch 71, the sub primary It is possible to prevent the coil energization switch 72 or the sub primary coil 111b from meaninglessly consuming power.
  • the superposition start reference voltage value for determining the establishment of the superposition control start timing ⁇ 1 and the superposition correction voltage value for judging the formation of the superposition correction timing ⁇ 2 depend on the characteristics of the ignition coil 11A, the spark plug 20, and the like. Since the optimum values are different, for example, by inputting a superposition start reference voltage value setting signal to the superposition start reference voltage value storage unit 302 (indicated by a broken line in FIG. 11), an arbitrary value is input to the superposition start reference voltage value storage unit 302.
  • the superposition start reference voltage value may be set, or by inputting a superposition correction voltage value setting signal to the superposition correction voltage value storage means 306 (indicated by a broken line in FIG. 11), the superposition correction voltage is set.
  • An arbitrary superposition correction voltage value may be set in the value storage unit 306.
  • the superposition control start timing ⁇ 1 is that the superposition start condition that is considered to require superimposition of the secondary current I2 is satisfied, and the superposition start condition is met. Since the energy superposition control is not performed until the power consumption is reduced, the power consumption for the energy superposition control is suppressed to a necessary minimum level. That is, in the internal combustion engine ignition device 4 of the present embodiment, even if the energy superposition control is performed in order to improve the ignition performance, it is possible to prevent the fuel consumption from being extremely deteriorated.
  • the superposition start condition is satisfied.
  • the period until the superimposition control start timing ⁇ 1 is reached, and further the period until the superposition correction condition is satisfied and the superimposition correction timing ⁇ 2 is reached, and the sub-path for maintaining the discharge path of the spark discharge generated in the spark plug 20 is increased.
  • the primary coil energization permission switch 71 and the sub primary coil energization switch 72 are driven to generate a superimposed magnetic flux in the sub primary coil 111b, and the period of superimposing on the secondary current I2 is shortened (the secondary current waveform in FIG. 12B).
  • the internal combustion engine ignition device 4 is further effective in reducing the deterioration of fuel consumption and preventing the spark plug 20 from shortening its life.
  • the timing of the end of the energy superposition control performed by the superposition control means 34 is arbitrary.
  • the elapsed time measured from the ignition timing IG is a high current holding time set as a high current period necessary and sufficient for stable combustion maintenance.
  • the time when it is reached may be set as the superposition control end timing ⁇ to end the energy superposition control.
  • Ignition device for internal combustion engine 10A Ignition coil unit 11A Ignition coil 111 Primary coil 112 Secondary coil 12A Ignition switch 15 Case 20 Spark plug 30A Internal combustion engine drive control device 31 Superimposition control means 40 DC power supply 50A Secondary current superposition means 61 Current detection resistance 62 Secondary side Voltage detection line

Abstract

L'invention concerne un dispositif d'allumage pour un moteur à combustion interne, permettant d'améliorer l'efficacité de l'allumage au moyen d'une décharge d'étincelle produite par une bougie d'allumage, et d'optimiser la consommation d'énergie pour l'allumage, ce qui permet de réduire une détérioration de l'efficacité du combustible. Un moyen (30A) de commande de superposition, dans le dispositif d'allumage (1) pour un moteur à combustion interne, estime une variation de tension pour une bobine secondaire (112) à partir d'une variation de tension dans une bobine primaire (111) obtenue au moyen d'un signal de tension de bobine primaire émanant d'un ensemble bobine d'allumage (10A), et après un temps fixé d'allumage destiné à interrompre un courant primaire d'une bobine d'allumage (11A), lorsque l'état de la tension de la bobine primaire satisfait à une condition de début de superposition prédéfinie dans laquelle il est difficile de maintenir le trajet de décharge d'une décharge d'étincelle produite par une bougie d'allumage (20), le moyen de commande de superposition délivre un signal de superposition de courant secondaire (Sp) à un moyen (50A) de superposition de courant secondaire, amenant un courant à être superposé d'un côté secondaire de la bobine d'allumage par rapport au moyen (50A) de superposition de courant et maintenant ainsi le trajet de la décharge d'étincelle produite par la bougie d'allumage (20) et formant un grand noyau de flamme, améliorant ainsi l'efficacité de l'allumage.
PCT/JP2018/014850 2018-04-09 2018-04-09 Dispositif d'allumage pour moteur à combustion interne WO2019198119A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021095456A1 (fr) * 2019-11-14 2021-05-20 日立Astemo株式会社 Dispositif de commande pour moteur à combustion interne
JPWO2021240898A1 (fr) * 2020-05-25 2021-12-02
JP7408453B2 (ja) 2020-03-25 2024-01-05 日立Ａｓｔｅｍｏ阪神株式会社 内燃機関用点火装置

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JP2014218995A (ja) * 2013-04-11 2014-11-20 株式会社デンソー 点火装置
JP2015017562A (ja) * 2013-07-11 2015-01-29 株式会社デンソー 点火制御装置
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WO2021095456A1 (fr) * 2019-11-14 2021-05-20 日立Astemo株式会社 Dispositif de commande pour moteur à combustion interne
JPWO2021095456A1 (fr) * 2019-11-14 2021-05-20
JP7212177B2 (ja) 2019-11-14 2023-01-24 日立Astemo株式会社 内燃機関用制御装置
JP7408453B2 (ja) 2020-03-25 2024-01-05 日立Ａｓｔｅｍｏ阪神株式会社 内燃機関用点火装置
JPWO2021240898A1 (fr) * 2020-05-25 2021-12-02
WO2021240898A1 (fr) * 2020-05-25 2021-12-02 日立Astemo株式会社 Dispositif de commande électronique
JP7318125B2 (ja) 2020-05-25 2023-07-31 日立Astemo株式会社 電子制御装置

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